An earlier single gun prototype was designated the Type 98 Ta-Se anti-aircraft tank in November 1941. The name taken from Taiku ("anti-air") sensha ("tank"). It was equipped with a single converted Type 98 20 mm AA machine cannon in a circumferential turret. During trials, it was determined that the chassis used for the Ta-Se was too small to be a stable "firing platform". It did not enter production.-Wikipedia